BOP.
Hydraulic BOP ram adopts hydraulic pressure to close and open the ram. When there's no electric power, the ram can be closed
manually. When the well needs to be closed for a long period, the ram must be locked manually. Hydraulic ram BOP can be used
independently, and it also can be used with other BOP.
The hydraulic ram BOP is equipped with various types of pipe rams, which can seal the annular space between casing and drilling
tools, and even the hollow well without pipe string.